Inconel 718平面移动强化感应加热工艺的温度调控分析

Temperature Control of the Planar Moving Strengthened Induction Heating Process of Inconel 718

针对平面感应加热工艺线圈磁场难以有效集中、回路空气阻抗过大、加热不均匀等困难,以航空应用较广的镍基高温合金Inconel 718为研究对象,开发了一种表面加热温度可精确调控的可移动平面强化感应加热工艺,并进行了电-磁-热场耦合转变机理以及加热温度的精确调控分析。基于Flux2D建立了该工艺的电-磁-热耦合有限元模型,分析了影响加热温度的主要工艺参数,并结合所搭建的实验平台进行了加热温度验证。此外,结合响应曲面法(RSM)建立了温度的预测控制模型,主要输入工艺参数为电流强度、频率、移动速度和表面冷却系数。进行了三组不同温度分布形态的调控实验分析,结果表明,基于RSM所建立的温度预测模型与实验的调控误差为20%,在可接受范围内。可以认为,通过合理调节该平面移动强化感应加热工艺参数,能够实现加热温度的预测和准确调控。

The planar induction heating process has some difficulties,for example,magnetic field is difficult to be effectively concentrated,air impedance in electromagnetic circuit is too large,and heating temperature is not uniform.In this paper,a kind of mobile planar induction heating process with adjustable surface heating temperature was studied and developed for the nickel super-alloy Inconel 718.The efficient and controllable mechanism of this planar induction heating was studied,including the coupling mechanism between electro-magnetic field and thermal field,and the precise regulation of heating temperature.The finite element simulation model of the process was established by Flux 2D.The main technological parameters affecting heating temperature were analyzed,and the heating temperature was verified with experimental platform.In addition,the regulation model of surface heating temperature was carried out based on RSM,in which the main parameters are respectively current intensity,frequency,velocity and surface coefficient.Three regulation experiments in different temperature distribution are conducted,and the results show that the errors during the regulation model and experiment results are no more than 20%,within the acceptable range.It is believed that the heating temperature can be accurately calculated and controlled by reasonably adjusting of the technological parameters of this Inconel 718 planar moving strengthen induction heating process.